Details of all current iGTs are available below.
| iGT | Registered Number | Registered Address |
| British Gas Pipelines Limited | 3226380 | Millstream Maidenhead Road Windsor Berkshire SL4 5GD |
|
Energetics Gas Limited |
SC303150 | Silverwells House 114 Cadzow Street Hamilton ML3 6HP |
|
ES Pipelines Limited |
3822878 | Carmelite 50 Victoria Embankment Blackfriars London EX4Y 0DX |
|
ESP Connections Limited |
3234745 | Carmelite 50 Victoria Embankment Blackfriars London EX4Y 0DX |
| ESP Networks Limited | 2865198 | Carmelite 50 Victoria Embankment Blackfriars London EX4Y 0DX |
| ESP Pipelines Limited | 3405272 | Carmelite 50 Victoria Embankment Blackfriars London EX4Y 0DX |
| Fulcrum Pipelines Limited | 06006362 |
Carr House Greaseborough Road Rotherham South Yorkshire S61 4QQ |
| GTC Pipelines Limited | 3104203 | Energy House Woolpit Business Park Woolpit Bury St Edmunds Suffolk IP30 9UP |
| The Gas Transportation Company Limited | FC020169 | PO Box 310 Sydney Vane House Rue de Commerce St Peter Port GY1 3TB Guernsey |
| Utility Grid Installations Limited | 3958461 | Energy House Woolpit Business Park Woolpit Bury St Edmunds Suffolk IP30 9UP |
| Independent Pipelines Limited | 2828692 | Ocean Park House East Tyndall Street Cardiff CF24 5GT |
| Quadrant Pipelines Limited | 2528816 | Ocean Park House East Tyndall Street Cardiff CF24 5GT |
|
SSE Pipelines Limited |
2742721 |
55 Vastern Road |